Improvement in methods of drawing patterns for flaring vessels



4b. Fil/zdffzhzrg: awz'nyPaZZr/zf far lz! .11d ZZ PATEmn J U1. 41871 v@Hummm UNITED STATES ORLANDO B. VANDENBURG, OF FINDLAY, OHIO.

IMPROVEMENT IN METHODS OF DRAWING PATTERNS FOR FLARING VESSELS.

Specication forming part of Letters Patent No. 116,647, dated July 4,1871.

To all whom it may concern:

Be it known that I, ORLANDO B. VANDEN- BURG, of Findlay, in the countyof Hancock and State of Ohio,have invented a new and Improved Method ofDrawing Patterns i'or Cutting' Sheet Metal; and I do hereby declare thatthe following is a full, clear, and exact description thereof7 whichwill enable others skilled in the art to make and use the same,reference being had to the accompanying drawing forming part of thisspeciiication, in which the diagram illustrates my improved method ot'drzuving patterns.

The object of the present invention is to pro Vide a convenient andreliable system of laying' out on sheet metal the necessary lines sothat the metal can be cut to be bent into truncated cones.

The follo\\'i11g is the description of my method: The height of the concirst measured on a line a b, the extremities ot' which meet, at rightanglee, the lines c d and cf. The Iine c d is equal in length to thelong, and the line c fto the short, diameter of the cone. Both thelast-named lilies are bisected by a. b. Lines are next drawn through thepoints c c and l f, so that the point g is found. An cquilateraltriangle, cf l1, is erected on the line cf, and a semicirclc, e if,described from the center b. The sides l@ j' and lL e of the triangleare extended until they meet a tangent,

j i lr, of the circle e if, the said tangent being at right angles tothe line a b. The length j k thus found is next, by perpendiculars j land k m, transferred to the tangent l 'In of a circle, An o, which isdescribed from the point g and radius g e, said tangent m being parallelto j k. On the diameter n o I next erect an equilateral triangle, n 0 p,from the point p of which I draw lines to the points l and m, cuttingthe circle n o at yr and s. From the point g and radius g c I nextdescribe the outer circle tu. The radiuses yr c and s fw of this circle7through the points 1' and s, produce between the two circles a o and t ujust one-half the desired length ot' sheet. By addin g another length,as far as n and the entire sheet a s Iw t is produced, to the ends ofwhich suiiicient material for overlapping may he added.

Having thus described my invention7 I claim as new and desire to secureby Letters Patent- The method of drawing patterns for cutting sheetmetal, substantially as herein shown and described.

ORLANDO Il. VANDIJNBURG.

Vitnesses:

E. T. DUNN, D. B. BEARDSLEY.

